Hello
The problem I have with my TV is that sometimes it switches itself into standby mode without me pressing any buttons on the remote, then when I switch it back on using the remote the screen flickers 2-3 times then it switches off again, this process is sometimed repeated upto 7-8 times before I get the TV to switch and stay on, sometimes it does it after I've switched on to begin watching telly and other times it happens after I've been watching for some time, its a really annoying problem and sometimes a hard reset (switch mains power off) is the only way to cure it, yet on other days the TV works faultlessly, is this a known fault or something new to you? I've had the TV since the beginning of the year.

Its the problem of overheating in the power supply board of the TV.on the power supply board of the TV there are few capacitors and IC.any of this ic is got short or may be weak.so due to this when you start the TV the current passes from electric outlet to the power supply board of TV.but when the current passes from that weak/faulty part at that time current gets stopped or slow and the board overheats and TV shuts off. this is a common problem faced by many other users too.the possible option to solve this issue is to check the power supply board by a meter and continuity tester and replace the faulty component on the board which is short due to which power supply board is getting overheated.its bit technical job but yes its not at all a costly repair to do or get it done by the technician. for required parts it can be easily available from local electronic hardware shop.Hope this help in solving the problem, Take care.....

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I don't have service mode specifications but I do have a Samsung and looked around for how to get it in service mode some time ago because the HDMI cables somehow disconnected themselves a lot. Thought it was an electronic problem but it turned out to be a parenting problem instead SO I have never used this information and can not vouch for it. I cut and paste it from a note I copied from a forum entry to use at your discretion:
First post:
To enter "Service Mode" Press the remote - control keys in this sequence :
From Standby Info-Menu-Mute-Power On
- The buttons are active in the service mode.
Remote - Control Key : Power, Arrow Up, Arrow Down, Arrow Left, Arrow Right, Menu, Enter, Number Key(0~9)
Careful though there are things you shouldn't touch in this menu.

Another post:
Method 1
Put TV on standby and then push in series these buttons on the remote: 'info, menu, mute, power' the TV will then turn itself on and display a menu.
Method 2
Turn the power off. On the remote, press Mute followed by 1, 8, 2, Power in sequence.
Method 3
With the TV in standby, press the {DISPLAY} {P.STD} {MUTE} {POWER} on the remote.
Method 4
With the TV in standby, press the {SLEEP} {P.STD} {MUTE} {POWER} on the remote.
Method 5
With the TV in standby, press the {DISPLAY} {MENU} {MUTE} {POWER} on the remote.
Method 6
With the TV in standby. On the remote, press Mute followed by 1, 1, 9, Enter in sequence.
Samsung LCD Monitor Service Menu Instructions

End quote.
Good luck. Just a basic suggestion you probably don't need: keep track of any changes made by writing them down so you can put it all back if you have to.

Try pressing the small reset button on the back, it works, and you will not loose any stored information which caused the unit to go in the stand by mode.

or
Have you tried turning it off for an hour and then turning it back on. This happens to me quite often and leaving it off for a while ususally allows it to come back on. Also have you tried to press the TV/AV button on the remote as sometimes it switches to TV mode when its on standby and then standby won't work as its on TV mode and needs to go back on to AV mode. Basically just press the AV button on the digibox remote and then try standby.

or
if the batteries are removed and left for about 20 minutes before being replaced again, everything works as it should.
or
if any of the above suggestions does not work then you have to open the unit and on the main board of the tv there is a thin mini tube light like component called fuse you will have to replace that fuse .the fuse is very very cheap and you can easily get it at any electronics shop.and if still the unit does not work then there is a major fault in the power supply board and should be taken to the service center for diagnosing the fault that it is repairable or not.but i hope the above information provided will definately help you to solve your problem.

It could be one of a couple of problems really, the first one may be
that your analogue signal is being switched over to digital which is
happening across the UK at the moment, buying a digital receiver would
resolve this straight away. It could be a problem with the ariel
connection to the TV, check that its all pushed in properly at the back
of the TV. Failing this then its a problem with the TV set, the fact
that the set produces a picture on other sources (dvd) implies that if
it is a fault with the TV its with the ariel connection.

unit seems to go into protect mode.Theres very little that can be done..There is good chance unit needs to be checked at a repair shop.Try to find one that is authorized for your particular brand if possible